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p/2265075If you edit a map that's in a collection and save changes, it disappears from all collections it's in and if you try to add it to a collection afterwards osu! crashes.
I made a collection for my WIP maps so it's easier to browse through them, but with this problem it's kinda defeating the purpose.
Not sure how this would be fix-able since you change the beatmap and it makes sense for it to get removed from a collection..
XPJ38 edit: here's a screenshot of what happens after clicking on 1. just after editing the map:
After that, osu! is running but totally locked. Only way to get out of here is to close osu! by closing the window.